initial commit

helloworld.asm

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+KERNAL_CLEAR_SCREEN = $e544 ; KERNAL ROM routine.
+VICSCN              = $0400 ; VIC-II Screen Video Matrix, 1024 (int).
+* = $8000
+ 
+     .word coldstart            ; coldstart vector
+     .word warmstart            ; warmstart vector
+     .byte $C3,$C2,$CD,$38,$30  ; "CBM8O". Autostart string
+ 
+coldstart
+     sei
+     stx $d016
+     jsr $fda3 ;Prepare IRQ
+     jsr $fd50 ;Init memory. Rewrite this routine to speed up boot process.
+     jsr $fd15 ;Init I/O
+     jsr $ff5b ;Init video
+     cli
+ 
+warmstart
+; Insert your code here
+     jsr KERNAL_CLEAR_SCREEN
+
+     ; read string by byte into vram until null byte
+     ldx #0
+loop
+     lda my_string,x
+     cmp #$00
+     beq bail
+     sta VICSCN,x
+     inx
+     jmp loop
+bail
+     ; pretty colors
+     inc $d020
+     jmp *-3
+
+.enc "screen"
+my_string .null "HELLO WORLD!"
+.enc "none"
+ 
+* = $9fff                     ; fill up to 8k or cartconv will fail
+     .byte 0

make.sh

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+#!/bin/sh
+64tass helloworld.asm -o helloworld.prg
+cartconv -t normal -n "Hello World" -i helloworld.prg -o helloworld.crt